<div class="doc-item" id="doc-832"><h2 class="doc-item-name">ensure<span class="namespace">(clojure.core)</span></h2><ul class="var-arglists"><li>(<span class="var-name">ensure</span>  ref)</li></ul><div class="var-docstring"><p>Must be called in a transaction. Protects the ref from modification
  by other transactions.  Returns the in-transaction-value of
  ref. Allows for more concurrency than (ref-set ref @ref)</p></div><div class="var-source"><pre>; clojure/core.clj:1384
(defn ensure
  [#^clojure.lang.Ref ref]
    (. ref (touch))
    (. ref (deref)))</pre></div><div class="license"><p>Copyright (c) Rich Hickey. All rights reserved.</p><p>The use and distribution terms for this software are covered by the <a href="http://opensource.org/licenses/eclipse-1.0.php">Eclipse Public License 1.0</a>, which can be found in the file
          epl-v10.html at the root of this distribution. By using this software
          in any fashion, you are agreeing to be bound by the terms of this
          license. You must not remove this notice, or any other, from this
          software.</p></div></div>